I must mention that I find it awesome that she shares part of her name with part of the name of one of my favorite fields in science: Astronomy! And all sorts of related things! Like Asteroids!

I'm not sure if the name Astrid and the root word aster- are related, but aster- means "star" (reference), which is close to the meaning of the name Astrid, "divine strength" or more paganly "heavenly strength". As noted on Wiktionary, Astrid is derived from an Old Norse name, Ástríðr. The name has two parts, either ást ("love, joy") or áss ("deity") and fríðr ("beautiful").

Astrid certainly is a "beautiful joy", that's for sure, no matter what we call her!

For a trip down memory lane, here's the same topic about Luca: Luca's Nicknames.